Answer:
Oxygen is a chemical element that constitutes 21 percent of the Earth's atmosphere, that is capable of combining with all elements except some noble gases, that is active in physiological processes of almost all known organisms, and that is involved especially in combustion — see Chemical Elements Table.
Explanation:
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The answer is A. Smoking cigarettes
While most of these would cause a risk lung cancer, they are not voluntary. You can't control air pollution or a family history of lung cancer. However, you can control smoking cigarettes and you chose to smoke them so that would be a voluntary risk of getting lung cancer.
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Answer:
Speed matters in volleyball because players are required to move quickly in multiple directions throughout the entire game. And coordination is important it plays a key role in digging and spiking the ball.